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    SubjectRe: 2.6.6 is crashing repeatedly
    On  May 27, linux@horizon.com wrote:
    > Even with neilb's patch, I just got an nfs oops:

    As Olaf Kirch just said on nfs@lists.sourceforge.net:

    > Hi Neil,
    >
    > you recently posted a patch that should fix readdir encoding in
    > nfsd. You say there
    >
    > Note that as the offset and whole response is known to be
    > 4byte-aligned, the offset pointer will never be split over
    > two pages.
    >
    > This is not true. The dirent offset is a 64bit quantity, so it's quite
    > possible it will be split across the page boundary. I'm working on a
    > patch...

    And that is exactly the problem you have hit:

    > Unable to handle kernel paging request at virtual address f2590000
    > printing eip:
    > c01a99a1
    > *pde = 004b1067
    > *pte = 32590000
    > Oops: 0002 [#1]
    > DEBUG_PAGEALLOC
    > CPU: 0
    > EIP: 0060:[<c01a99a1>] Not tainted
    > EFLAGS: 00010246 (2.6.6)
    > EIP is at encode_entry+0x51/0x530
    > eax: cc010000 ebx: 00000000 ecx: 000001cc edx: f32dcdf8
    > esi: f258fffc edi: d4ec21cc ebp: 000001e0 esp: ebfd9b98

    Note that "esi" is pointing to 4 bytes from the end of a page, and you
    are getting a bad reference at the start of the next page.
    The code is storing a 64bit value here, and it doesn't fit.

    Stay tuned....

    NeilBrown
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